From my understanding the files are in plain png/bmp neither would work properly with multiple images.Newer games textures are a form of mipmaped images where each img within the texture represents a mip level.

WhoElseButMe on Nov 26, 2009 wrote:It's that lack of respect amongst their peers and ignorance towards modding etiquette that keeps us who know this stuff well from spreading it like wild fire. We do still enjoy playing the game and if you need to cheat to play a game PLAY SOMETHING ELSE YOU DON'T SUCK AT.

WhoElseButMe on Nov 26, 2009 wrote:It's that lack of respect amongst their peers and ignorance towards modding etiquette that keeps us who know this stuff well from spreading it like wild fire. We do still enjoy playing the game and if you need to cheat to play a game PLAY SOMETHING ELSE YOU DON'T SUCK AT.

if tdx file is in folder, it forces texture reading from tdx, even if properly named pngs are there as well.tdx implementation doesnt support filtering. png is filtered by default.it wont be filtered only if there are bypass flags in bsp (which canada doesnt have)

basically it means that if you see textures and they are not filtered - you have can.tdx in folder.to know if game is using pngs, you can always edit texture and check if it changed in game.